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. 1984 Mar;17(3):283–293. doi: 10.1111/j.1365-2125.1984.tb02343.x

The effects of acute or chronic ingestion of propranolol or metoprolol on the metabolic and hormonal responses to prolonged, submaximal exercise in hypertensive men.

I A Macdonald, T Bennett, A M Brown, R G Wilcox, A M Skene
PMCID: PMC1463374  PMID: 6370283

Abstract

We have studied the effects of single oral doses of, and of 28 days treatment with, placebo, propranolol or metoprolol, on the metabolic and hormonal responses to prolonged exercise in hypertensive men. Blood glucose levels fell during exercise on all occasions. No additional effects of the beta-adrenoceptor antagonists, compared to placebo, were observed. The exercise-induced increase in plasma potassium was enhanced after a single dose of propranolol or metoprolol, and also after chronic treatment with propranolol. Chronic treatment with either drug led to an increase in plasma potassium levels at rest. The growth hormone response to exercise was potentiated by a single dose of metoprolol or propranolol, and after chronic treatment with the drugs. A single dose of propranolol (but not metoprolol) was associated with a marked increase in plasma cortisol and adrenaline levels during exercise. After chronic treatment no such increase occurred. In both the acute and chronic phases of the study, blood lactate levels were higher during exercise in the presence of either propranolol or metoprolol compared to placebo, whereas non-esterified fatty acid levels were lower. A single dose of metoprolol produced a significantly greater reduction in blood glycerol levels during exercise than a single dose of propranolol. After chronic treatment, both propranolol and metoprolol produced similar reductions in blood glycerol levels during exercise. After a single dose, both drugs significantly augmented the increase in plasma noradrenaline levels during exercise. A similar effect was seen after chronic treatment.

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Selected References

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